<!-- 父级页面:控制除了登录页以外的所有子页面的头部与左侧菜单栏 -->
<template>
    <div style="display: flex;">
        <!-- 左侧菜单栏 -->
        <div :style="{width:(isCollapse?'64px':'208px')}">
            <el-menu
                    background-color="#3c82f5"
                    style="width:100%;height:100vh;"
                    text-color="#fff"
                    active-text-color="#ff0"
                    unique-opened
                    router
                    :collapse="isCollapse"
                    :collapse-transition="false"
            >
                <el-row style="padding-top: 10px;">
                    <el-col :span="2"></el-col>
                    <el-col :span="7" style="padding-left: 7px;">
                        <el-avatar src="/imgs/admin/logo.png" style="width:35px;height: 35px;"></el-avatar>
                    </el-col>
                    <el-col :span="isCollapse ? 0 : 13">
                        <span style="color:#fff;font-weight:bold;position:relative;top:8px;left:2px;">智慧车辆</span>
                    </el-col>
                </el-row>
                <el-sub-menu index="1">
                    <template #title>
                        <el-icon>
                            <User/>
                        </el-icon>
                        <span>用户管理</span></template>
                    <el-menu-item index="/user">用户列表</el-menu-item>
                </el-sub-menu>
                <el-sub-menu index="2">
                    <template #title>
                        <el-icon>
                            <Van/>
                        </el-icon>
                        <span>车辆管理</span></template>
                    <el-menu-item index="/vehicle">车辆列表</el-menu-item>
                </el-sub-menu>
                <el-sub-menu index="3">
                    <template #title>
                        <el-icon>
                            <Location/>
                        </el-icon>
                        <span>围栏管理</span></template>
                    <el-menu-item index="/geofence">电子围栏</el-menu-item>
                </el-sub-menu>
            </el-menu>
        </div>
        <div :style="{width:(isCollapse?'calc(100% - 64px)':'calc(100% - 208px)')}">
            <!-- 右侧顶部条 -->
            <el-header style="padding-top: 22px;height:10vh;background-color:#fff;">
                <el-row :gutter="10">
                    <el-col :span="18">
                        <el-icon style="font-size: 20px;" @click="changeCollapsed">
                            <Expand/>
                        </el-icon>
                    </el-col>
                    <el-col :span="6" style="position: relative;">
                        <el-dropdown trigger="click" style="position: absolute;right:20px;">
              <span style="font-size:19px;font-weight: bold;">
                {{ user.username }}
                <el-icon><arrow-down/></el-icon>
              </span>
                            <template #dropdown>
                                <el-dropdown-menu>
                                    <el-dropdown-item @click="logout">退出登录</el-dropdown-item>
                                </el-dropdown-menu>
                            </template>
                        </el-dropdown>
                    </el-col>
                </el-row>
                <!-- 面包屑导航 -->
                <el-breadcrumb separator="/" style="position: relative;top: 20px;">
                    <el-breadcrumb-item>首页</el-breadcrumb-item>
                    <el-breadcrumb-item v-for="item in breadcrumb">{{ item }}</el-breadcrumb-item>
                </el-breadcrumb>
            </el-header>
            <!-- 右侧主体内容(可变区域) -->
            <el-main style="height:90vh;padding:0;overflow-y: auto;">
                <router-view/>
            </el-main>
        </div>
    </div>
</template>

<script setup>
import {onMounted, ref} from "vue";
import {useRoute, useRouter} from "vue-router";

//定义变量用于控制左侧菜单栏是否折叠
const isCollapse = ref(false);

//定义处理菜单栏折叠的方法
const changeCollapsed = () => {
    isCollapse.value = !isCollapse.value;
}

//获取当前登录的用户数据
const user = ref(getUser());

//定义一个退出登录的方法
const logout = () => {
    if (confirm('您确认要退出登录吗?')) {
        //退出时要清空用户数据
        localStorage.removeItem('user');
        //退出后要去到登录页
        window.location.href = '/login';
        //也需要把已经取出来的user对象清空
        user.value = '';
    }
}

//定义数组用来维护面包屑导航当前展示的值
const breadcrumb = ref([]);
//定义对象用来维护路由path与面包屑数组值的对应关系
let map = {
    '/user': ['用户管理', '用户列表'],
    '/vehicle': ['车辆管理', '车辆列表'],
    '/geofence': ['电子围栏', '围栏管理'],
    '/geofenceMap': ['电子围栏', '新增围栏'],
    '/application': ['调度管理', '申请列表'],
    '/audit': ['调度管理', '调度审核'],
    '/distribute': ['调度管理', '车辆分配'],
    '/dict': ['数据字典', '字典管理'],
    '/dictOption': ['数据字典', '字典项管理']
};
const route = useRoute();
//定义一个更新面包屑值的方法,只要路由发生变化,立即触发更新面包屑
const updateBreadcrumb = (route) => {
    //获取当前路由的path值
    const path = route.path;
    //从上面的map对象中获取到指定path对应的面包屑数组值,并赋值给breadcrumb
    breadcrumb.value = map[path];
}
//表示一进到页面立即执行的时机
onMounted(() => {
    //更新面包屑的值--初始化
    updateBreadcrumb(route);
})
//获取一个路由器对象
const router = useRouter();
//监听路由的变化,如果发生了改变
router.beforeEach((to, from, next) => {
    //立即更新面包屑的值
    updateBreadcrumb(to);
    //再进行路由跳转
    next();
})
</script>









